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Maximum Junction Temperature
 
 
( Tj MAX )

Maximum allowable transistor junction temperature. Silicon transistors normally have a maximum allowable junction temperature of 200 C. Devices packaged in plastic may have this value reduced to 150 C.

Tj max is an industry standard number based on projected lifetime; in most cases it does not represent a boundary to catastrophic failure of the transistor. Operation at temperatures above Tj max is not recommended as it will result in greatly decreased lifetimes since operating life is exponentially proportional to the inverse of the operating temperature.

Tj max may also be familiarly (though technically incorrectly) used to represent the maximum channel temperature (Tch) of a GaAs FET.

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this page last updated: 1 October 1999